Dynamo-electric machines



Oct. 26, 1965 J. TUDGE DYNAMO-ELECTRIC MACHINES Filed Nov. 5, 1962 2Sheets-Sheet 1 Oct. 26, 1965 J. TUDGE 3,214,617

DYNAMO-ELECTRIC MACHINES Filed Nov. 5, 1962 2 Sheets-Sheet 2 UnitedStates Patent 3,214,617 DYNAMO-ELECTRIC MACHINES Joseph Tudge, Walkden,Manchester, England, assignor to Associated Electrical IndustriesLimited, London, England, a British company Filed Nov. 5, 1962, Ser. No.235,230 Claims priority, application Great Britain, Dec. 1, 1961,43,058/ 61 4 Claims. (Cl. 310-54) This invention relates todynamo-electric machines,

and more particularly to the rotors of turbo-attenuators. U.S. PatentNo. 3,046,424 is directed to a method of admitting coolant into a rotorwinding. This method According to the present invention the rotor of adynamo-electric machine comprises a core having slots therein, a windingincluding conductors located in the slots, there being a plurality ofconductors and a feed conductor in each slot, end connections connectingsaid conductors and feed conductors electrically in series to formcoils, said conductors and feed conductors being formed withlongitudinal passages, the conductors in each slot being arranged in twostacks and transposed so that each in turn occupies the lowermostposition in the slot, insulating liquid connectors between each feed conductor passage and the said lowermost part of each conductor passage inthe same slot and means for passing cooling liquid through all theconductors and feed conductors, of conductors having longitudinalpassages for coolant, said plurality of conductors being divided into afirst group of conductors which are so transposed that each in turn hasa portion which is radially inside the other conductors in that group,and a second group of conductors lying radially inside the first group,electrically insulating connectors adapted to pass coolant between thelongitudinal passages of said portions of the conductors in the firstgroup and the longitudinal passages of the conductors in the secondgroup.

In a preferred embodiment the second group of conductors comprises oneconductor and each such conductor in the winding is connected either toa coolant supply duct extending axially in the rotor shaft, or to acoolant discharge duct extending axially in the rotor shaft.

The transposition of the rotor conductors may be in the manner employedin so-called Roebel Bars, i.e. the conductors are arranged in the slotin two stacks side by side, the conductors in one stack slopingdownwards to a radially innermost position, then bend sideways to form aportion radially inside the other conductors in the bar, and then slopeupwards. Thus each of the conductors in turn occupies the radiallyinnermost position in the slot, but at different locations along theslot.

In order that the invention maybe more clearly understood reference Willnow be made to the accompanying drawings in which:

FIG. 1 is a perspectived rawing of the conductors of a coil sideaccording to the present invention.

FIGS. 2A, 2B, 2C are sections taken on planes AA, BB, and CCrespectively of FIG. 1.

FIG. 3 is a diagrammatic view of six coil sides showing the coolantflow.

In FIG. 1 water is supplied by any suitable means, but preferably by themethod disclosed in U.S. Patent No.

3,214,617 Patented Oct. 26, 19 65 2 3,046,424 into the feed inletconductor 1. From this conductor the water flows through theelectrically insulating connectors 2, into the longitudinal passages 3of the conductors 4. In these longitudinal passages the water flows tothe other coil side where it is discharged through electricallyinsulating connectors into a discharge feed conductor. From thisdischarge conductor the water is discharged to waste by any suitablemeans. It will be noted that the conductors 4 are transposed so thateach in turn becomes radially innermost. This brings each in turn inclose proximity with the inlet conductor 1, which is radially inside allthe conductors 4. The connectors 2 lie in oblique grooves 8 milled inthe inlet conductor 1.

FIGS. 2A, 2B and 20 show more clearly the arrangement of theelectrically insulating connectors. The electrically insulating portion2 is joined to the inlet conductor 1 by a metal tube 3. This enables aleakproof joint to be made. Irregularities at the top and bottom of thecoil-side are smoothed off by the packers 5, 6 and 7. Packer 7 has beenomitted from FIG. 1 to avoid confusion.

FIG. 3 which is an explanatory winding diagram shows three coilsassociated with one pole, and for simplicity each coil side has onlyseven conductors, six of which are transposed and one of which is aninlet or discharge feed conductor. The connectors from the inletconductors to the radially innermost portions of transposed conductorsare indicated by letters A to R.

The connectors between the discharge conductors and the radiallyinnermost portions of the transposed conductors are indicated by thepairs of letter ab, be etc. By tracing through the circuit it will benoticed that each inlet connector feeds two paths each terminating at adifferent discharge connector, and each discharge connector is suppliedby two paths each originating at a different inlet connector.

It will be noticed from FIG. 3 that the middle coil has oppositelyhanded cross-overs. The reason for this will be appreciated aftertracing out the water circuit for the smallest coil when it will benoticed that the discharge connector gh would be supplied from L insteadof from G if the handing were the same throughout. The supply from Lhowever would pass from an inlet to an outlet without having passedthrough the Roebel Bar at all. This is undesirable and hence eachalternate coil is handed oppositely.

What I claim is:

1. In a turbo alternator machine, a rotor comprising a core having slotstherein, a winding including conductors located in said slots in saidcore, there being a plurality of conductors and a feed conductor in eachsaid slot, end connections connecting said conductors and feedconductors electrically in series to form coils, all said conductors andfeed conductors comprising longitudinal passages, insulating liquidconnectors between each feed conductor passage and each conductorpassage in the same slot, and means for passing cooling liquid throughall the conductors and feed conductors.

2. In a turbo alternator machine, a rotor comprising a core having slotstherein, a winding including conductors located in said slots in saidcore, there being a plurality of conductors and a feed conductor in eachsaid slot, end connections connecting said conductors and feedconductors electrically in series to form coils, said conductors andfeed conductors comprising longitudinal passages, the conductors in eachsaid slot positioned in two stacks and transposed so that each in turnoccupies the lowermost position in the slot, insulating liquidconnectors between each feed conductor passage and the said lowermostpart of each conductor passage in the same slot, and means for passingcooling liquid through all the conductors and feed conductors.

3. In a turbo alternator machine, a rotor comprising a core having slotstherein, a winding including conductors located in said slots in said"core, there being a plurality of conductors and a feed conductor ineach said slot, end connections jconnecting said conductors and feedconductors electrically in series to form coils, said conductors andinlet conductors comprising longitudinal passages, insulating liquidconnectors between each feed con: duct or passage and each conductorpassage in the same slot, means for supplying cooling liquid to the feedconductors associated with the conductors forming one side of each coil,and means for discharging cooling liquid from the opposite side of eachcoil.

v 4. In a turbo alternator machine, a rotor comprising a core havingslots therein, a Winding including conductors located in said slots insaid core, there being a plurality 0f. conductors and a feed conductorin each slot, end connections connecting said conductors and feedconductors electrically in series to. form cores, said conductors andfeed conductors comprising longitudinal passages,

the conductors in each slot positioned in two stacks and transposed sothat each in turn occupies the lowermost 4 References Cited by theExaminer UNITED STATES PATENTS 7/62 Tudge 3l061 7/63 Fechheimer .a 31054MILTON O. HIRSHFIELD, Primary Examiner. DAVID X. SLINEY, Examiner.

1. IN A TURBO ALTERNATOR MACHINE, A ROTOR COMPRISING A CORE HAVING SLOTSTHEREIN, A WINDING INCLUDING CONDUCTORS LOCATED IN SAID SLOTS IN SAIDCORE, THERE BEING A PLURALITY OF CONDUCTORS AND A FEED CONDUCTOR IN EACHSAID SLOT, END CONNECTIONS CONNECTING SAID CONDUCTORS AND FEEDCONDUCTORS ELECTRICALLY IN SERIES TO FORM COILS, ALL SAID CONDUCTORS ANDFEED CONDUCTORS COMPRISING LONGITUDINAL PASSAGES, INSULTATING LIQUIDCONNECTORS BETWEEN EACH FEED CONDUCTOR PASSAGE AND EACH CONDUCTORPASSAGE IN THE SAME SLOT, AND MEANS FOR PASSING COOLING LIQUID THROUGHALL THE CONDUCTORS AND FEED CONDUCTORS.